Crash on resolution change

Description

When changing guest resolution by resizing its window, the VirtualBox process sometimes crashes (access violation, apparently "use after free" issue).
Minidump and log are attached. I also have a full dump (bigger than 1GiB, so will only upload when requested).

I have this problem on 4.2.4 with a Windows 7 host and Ubuntu 12 guest, in fact it happens more often than it did with the 4.1.x series.

I have attached the vbox log for the latest occurrence.

I have two external screens attached to my laptop which is normally in a dock and closed. One screen is horizontal and one vertical. When I boot ubuntu it does not come up using all of the real estate. I use a combination of Control G and Control L to make it detect the actual screen size and resize to fill it. Sometimes this crashes vbox, sometimes it works. If I manually resize a window using the "full screen" button on the top right, that always crashes vbox. Also, grabbing and dragging the border of the window to resize also always crashes vbox.

When I de-dock the laptop, it then has one screen which is a different size than either connected external screen. It usually does not crash when de-docking, but sometimes does when docking again.